CN205850545U - Double alkali Two-way Cycle coordinated desulfurization denitrating systems - Google Patents
Double alkali Two-way Cycle coordinated desulfurization denitrating systems Download PDFInfo
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- CN205850545U CN205850545U CN201620459272.2U CN201620459272U CN205850545U CN 205850545 U CN205850545 U CN 205850545U CN 201620459272 U CN201620459272 U CN 201620459272U CN 205850545 U CN205850545 U CN 205850545U
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- sodio
- calcium
- desulfurization
- absorbent
- way cycle
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Abstract
This utility model provides a kind of double alkali Two-way Cycle coordinated desulfurization denitrating system, promote that section, a sodio work in coordination with three sections of process of absorber portion and a calcium-based desulfurization absorber portion by oxidation, there is the effect of collaborative denitration, and double medium two stage cycle desulphurization system has the ability that regeneration of absorption solution recycles, and between two-stage absorption region, install turbulent pipe grid fairing additional play airflow uniform distribution effect, on the premise of reaching equal removal effect, can effectively reduce liquid-gas ratio, and reduce operating cost.
Description
Technical field
This utility model relates to environmental technology field, particularly relates to flue gas desulfurization technique, is specifically related to a kind of double alkali pair and follows
Ring coordinated desulfurization denitrating system.
Background technology
" coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-2020) " requires eastern region (Liaoning, Beijing, sky
11 provinces and cities such as Tianjin, Hebei, Shandong, Shanghai, Jiangsu, Zhejiang, Fujian, Guangdong, Hainan) newly-built Thermal generation unit atmosphere pollution
Concentration of emission basically reach gas turbine group emission limit (i.e. under the conditions of benchmark oxygen content 6%, flue dust, sulfur dioxide, nitrogen oxygen
Compound concentration of emission is respectively no higher than 10,35,50 milligrams/cubic metre), middle part (Heilungkiang, Jilin, Shanxi, Anhui, lake
8 provinces such as north, Hunan, Henan, Jiangxi) new-built unit is in principle close to or up gas turbine group emission limit, with encouraging western part
District's new-built unit is close to or up gas turbine group emission limit.To the year two thousand twenty, eastern region active service 300,000 kilowatts and above public affairs
With Thermal generation unit, 100,000 kilowatts and above provide Thermal generation unit and other Thermal generation unit with good conditionsi for oneself, change
Make rear Air Pollutant Emission concentration and basically reach gas turbine group emission limit.In view of Coal Combustion in China quality, to all of combustion
The flue gas that coal-fired plant produces is required for carrying out desulfurization and denitration processes, and makes the sulfur dioxide in flue gas content of discharge meet above-mentioned
Correlative link guaranteed request.
For the problem that China's major part region fire coal sulfur-bearing is too high, traditional single cycle desulfurization technology is extremely difficult to country
The new standard-required of Chinese Ministry of Environmental Protection.Use single cycle desulfurization technology, apply wet limestone-gypsum FGD technique, only pass through Calx
Stone serosity and coal-fired flue-gas are fully contacted desulfurization, even if under preferable operating mode, desulfuration efficiency is the highest also can only achieve 98%, for
The content of sulfur dioxide coal-fired flue-gas higher than 2000mg/Nm3, uses above-mentioned technology and technique to be difficult to qualified discharge,
So it is accomplished by increasing extra processing means or equipment, improves and run and maintenance cost, and environmental protection equipment can be increased account for
Ground, affects the integral layout of coal-burning power plant.It addition, the equipment for denitrifying flue gas of coal-burning power plant's discharge is often arranged on boiler emission cigarette
Behind road, by denitrating techniques such as SCR methods, the nitrogen oxides in flue gas is removed, but sometimes, denitrating system can not
Amount of nitrogen oxides in flue gas is reduced to meet national environmental protection emission request, needs to carry out collaborative taking off in other processing links
Nitre processes.
In order to improve desulfuration efficiency, those skilled in the art have started to attempt the desulphurization system that research and development are new, and Chinese invention is special
Profit application (application number 201510034481.2) discloses a kind of double circulation desulphurization system, by each self-loopa of two stage cycle serosity
Desulfurization, removes the sulfur dioxide in flue gas.But the technical scheme of this patent application needs constantly to put into sodio desulfurization
Absorbent, it is impossible to realize the regeneration of sodio desulfurization absorbent, therefore not only result in the significant wastage of operating cost, and whole
In serum recycle, Na ion concentration improves constantly also can affect gypsum slurries generation, and then reduces desulfuration efficiency, and it is on the implementation
There is bigger limitation.
It addition, the technical scheme of foregoing invention patent only has single desulfurization effect, two stage cycle serosity each circulation desulfurization,
It is not carried out the regeneration of sodio desulfurization absorbent, does not the most make full use of sodio desulfurization absorbent, thus result in operating cost
Significant wastage.Additionally, the uniform meeting in flue gas flow field after gas-liquid separation device declines to a great extent, also reduce the second circulation desulfurization district
Desulfuration efficiency in territory.
Utility model content
For the problems referred to above, the purpose of this utility model is to provide a kind of double alkali Two-way Cycle coordinated desulfurization denitrating system, its
There is the effect of collaborative denitration, and double medium two stage cycle desulphurization system has an ability that regeneration of absorption solution recycles, and
Install turbulent pipe grid fairing between two-stage absorption region additional and play airflow uniform distribution effect, in the premise reaching equal removal effect
Under, can effectively reduce liquid-gas ratio, and reduce operating cost.
For reaching above-mentioned purpose, the concrete technical scheme that this utility model is taked is:
A kind of double alkali Two-way Cycle coordinated desulfurization denitrating system, including:
A tower body as flue gas path；
Be sequentially arranged a gas approach along flue gas flow direction in described tower body, a sodio works in coordination with absorber portion and a calcium-based desulfurization
Absorber portion；
Described gas approach is provided with an oxidation accelerator injection apparatus；
Described calcium-based desulfurization absorber portion includes: some two grades of spraying layers, is positioned at the serosity below described two grades of spraying layers
Collection device, the fairing between described two grades of spraying layers and described serosity collection device, and it is communicated in described two
A calcium-base absorbing agent pond between level spraying layer and described serosity collection device；
Described sodio is worked in coordination with absorber portion and is included: connection is positioned at some one-levels in the sodio absorbent pond bottom described absorption tower
Spraying layer；
Described sodio absorbent pond and calcium-based slurries pond connect a regenerating unit simultaneously；
One regeneration serum outlet of described regenerating unit is communicated to the sodio absorbent pond bottom described absorption tower.
Further, described oxidation accelerator injection apparatus includes being arranged on the sidewall of described gas approach uniform many
Individual nozzle.
Further, fairing is selected from deflector, perforated trays, flow straightening grid or rectifier tube row.
Further, arranging multiple projection bottom described serosity collection device, the top of described projection or sidepiece have logical
Pore.
Further, it is tapered bottom described serosity collection device.
A kind of double alkali Two-way Cycle coordinated desulfurization method of denitration, comprises the following steps:
1) coal-fired flue-gas enters a flue gas path, uniformly mixes with oxidation accelerator, it is thus achieved that oxidation flue gas；
2) oxidation flue gas inversely contacts with the sodio absorbent after atomization and carries out one-level denitration desulfurization, obtains a denitration and takes off
Sulfur flue gas；Sodio absorbent recycles；
3) flow field of a denitration desulfurization fume is carried out rectification so that it is the calcium-base absorbing agent after flow field is uniform and after atomization
Reverse contact carries out two-grade desulfurizing, obtains secondary desulfuration flue gas；Calcium-base absorbing agent recycles；
4) when the pH value of sodio absorbent is less than a threshold values, a regeneration dress is injected in proportion with both calcium-base absorbing agents
Put；
5) the regeneration sodio serosity that regenerating unit produces supplements sodio absorbent.
Further, step 1) described in oxidation accelerator be the solution comprising ferric ion.
Further, step 2) described in the pH value of sodio absorbent be 10-12；Step 3) described in calcium-base absorbing agent pH
Value is 5.8-6.4.
Further, step 4) described in threshold values between the 5.5-6.5.
Further, step 4) in the injection ratio of sodio absorbent and calcium-base absorbing agent ensure Na ion concentration and calcium from
Sub-concentration ratio is 2:1.
Former flue gas is entered in absorption tower by absorption tower entrance, sequentially passes through sodio absorber portion, turbulent pipe grid fairing, calcium
Base absorber portion and flue gas demister, discharge eventually through absorption tower outlet.In the gas approach of absorption tower, it is provided with oxidation promote
Agent nozzle, promotes NO to be converted into NO for injection in tower2Oxidation accelerator.Circulating absorption solution after two-step desulfurization is in proportion
Squeezing into regenerating unit and carry out the regeneration of sodio absorbent, the supernatant after regeneration can be recycled as absorbent, after regeneration
Bottom residue serosity is sent into oxidation pond and is produced Gypsum Fibrosum.
This utility model utilizes a large amount of SO3 existed in serosity2-Ion, sprays into NO oxidation and promotes in porch, absorption tower
Agent, makes NO be converted into NO2, and utilize conversion limit, alkali liquor limit to absorb, finally discharge with absorbent after reaction.For realizing NO2Abundant
Absorbing, this utility model has selected the higher sodium salt solution of sulfur dioxide absorption efficiency as primary cycle absorbent, and two grades are followed
Ring absorbent still uses the lime stone slurry that pH is higher, and is pressed by the loop slurry after calcium-base absorbing agent and sodio absorbent desulfurization
Ratio is injected regenerated reactor and is reacted, make the Na ion concentration of participation regenerative response and calcium ion concentration ratio at about 2:1, with
Realize the regeneration of sodio absorbent, and generate the by-produced gypsum with economic worth.Desulfurized effect due to sodio absorbent
It is substantially better than calcium-base absorbing agent, it is possible to decrease the liquid-gas ratio of desulphurization system, thus reduces input and operating cost.It addition, at two grades
Turbulent pipe grid fairing is installed on serosity collection device top, plays the effect in uniform flow field, improves the gas of two-grade desulfurizing absorber portion
Liquid mass-transfer efficiency, increases desulfuration efficiency.
By taking technique scheme, this utility model has the advantage that desulfuration efficiency is high, owing to have employed two kinds not
Same absorbing medium, can be effectively improved desulfuration efficiency, reduces liquid-gas ratio, and the renewable recycling of sodio absorbent, reduces
Operating cost.And collaborative denitration can be realized.Higher owing to using sodio absorbent to process integrated cost, this practicality is new
Type not only achieves regeneration cycle, and utilizes the strong basicity of sodio absorbent, carries out collaborative denitration simultaneously, improves sodio and inhales
Receive the utilization rate of agent, it is achieved that benefit.
Accompanying drawing explanation
Fig. 1 is the structural representation of double alkali Two-way Cycle coordinated desulfurization denitrating systems in this utility model one embodiment.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clear, complete description, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole realities
Execute example.Based on the embodiment in this utility model, those of ordinary skill in the art are institute under not making creative work premise
The every other embodiment obtained, broadly falls into the scope of this utility model protection.Coordinate institute's accompanying drawing to of the present utility model below
Feature and advantage elaborate.
In the embodiment shown in fig. 1, it is provided that a kind of double alkali Two-way Cycle coordinated desulfurization denitrating systems, including:
A tower body 1 as flue gas path；
Be sequentially arranged gas approach 2 along flue gas flow direction in tower body 1, sodio works in coordination with absorber portion 3 and calcium-based desulfurization absorber portion
5；
Gas approach 2 is provided with oxidation accelerator injection apparatus 12；
Calcium-based desulfurization absorber portion 5 includes: some two grades of spraying layers 6, is positioned at the serosity collection device below two grades of spraying layers 6
8, the fairing 7 between spraying layer 6 and serosity collection device 8, and it is communicated in two grades of spraying layers 6 and serosity collection device
Calcium-base absorbing agent pond 9 between 8；
Sodio is worked in coordination with absorber portion 3 and is included: connection is positioned at some one-level spraying layers in the sodio absorbent pond 4 bottom absorption tower
10；
Sodio absorbent pond 4 and calcium-based slurries pond 9 connect regenerating unit 11 simultaneously；
The regeneration serosity outlet of regenerating unit 11 is to the sodio absorbent pond 4 bottom absorption tower.
Specifically, oxidation accelerator injection apparatus includes being arranged in multiple nozzles (figure uniform on the sidewall of gas approach
Do not show).
Fairing 7 as shown is the pipe row that two row are arranged in parallel, and can also select deflector, many in embodiment
The structure with water conservancy diversion, flow equalizing function of other structures such as hole pallet, flow straightening grid.
It addition, in certain embodiments, bottom serosity collection device, it is arranged above with multiple projection, the top of described projection
Or sidepiece has passage.Flue gas can flow through from these passages, can make the edge of serosity collection device on this basis
It is close to the tower wall on absorption tower, it is to avoid calcium-base absorbing agent flows at the bottom of tower along tower wall.
In other embodiment, being tapered bottom serosity collection device, cone angle is more than 160 °.
Double alkali Two-way Cycle coordinated desulfurization method of denitration that device shown in Fig. 1 is implemented, comprise the following steps:
1) coal-fired flue-gas enters a flue gas path, uniformly mixes with oxidation accelerator, it is thus achieved that oxidation flue gas；
2) oxidation flue gas inversely contacts with the sodio absorbent after atomization and carries out one-level denitration desulfurization, obtains a denitration and takes off
Sulfur flue gas；Sodio absorbent recycles；
3) flow field of a denitration desulfurization fume is carried out rectification so that it is the calcium-base absorbing agent after flow field is uniform and after atomization
Reverse contact carries out two-grade desulfurizing, obtains secondary desulfuration flue gas；Calcium-base absorbing agent recycles；
4) when the pH value of sodio absorbent is less than a threshold values, a regeneration dress is injected in proportion with both calcium-base absorbing agents
Put；
5) the regeneration sodio serosity that regenerating unit produces supplements sodio absorbent.
Wherein, step 1) described in oxidation accelerator be the solution comprising ferric ion.
Step 2) described in the pH value of sodio absorbent be 10-12.
Step 4) described in threshold values between the 5.5-6.5.
Step 4) in the injection ratio of sodio absorbent and calcium-base absorbing agent ensure Na ion concentration and calcium ion concentration ratio
Example is 2:1.
The former flue gas of sulfur-bearing enters absorption tower through entrance, sequentially passes through sodio desulfurization absorber portion, calcium-based desulfurization absorber portion, flue gas
Demister, is finally discharged by outlet.Main operational principle is:
The most former flue gas is by through absorption tower entrance, and oxidation accelerator, such as Fe3+、ClO2 -、ClO-、KMnO4Deng by a definite proportion
Example mixes；
2. the flue gas after mix homogeneously enters absorption tower, first inversely contacts with the sodio absorbent after atomization and takes off
Sulfur, the serosity collection after desulfurization recycles to the outer stock tank of tower.Sodio absorbent selects sodium hydroxide, for realizing synchronizing denitration,
Effecting reaction pH is between 10-12, and desulfurization rear slurry falls after rise to the pond recycling of tower prime cement.
3. flue gas is after first order absorption agent desulfurization, passes upward through two grades of serosity collection devices, and whole through turbulent pipe grid device
After stream, inversely contacting with the calcium-base absorbing agent after atomization and carry out desulfurization, calcium-base absorbing agent pH, between 5.8-6.4, starches after desulfurization
Liquid liquid trap recovery in tower is sent the outer stock tank of tower back to and is recycled.
Whole sodio absorbent all injects regenerated reactor, and the injection rate of calcium-base absorbing agent need to ensure to make participation regeneration anti-
The Na ion concentration answered and calcium ion concentration ratio are at about 2:1.After being sufficiently stirred for reaction completely, the sodio that top is regenerated
Absorbent clear liquid is injected back into the outer stock tank of tower, and lower slurry is squeezed into oxidation pond and blasted oxidation air, and takes off through cyclone and vacuum belt
By-produced gypsum is made after water machine.
As a example by a practical sulphur removal system, using sodium carbonate as sodio absorbent, lime stone slurry as calcium-base absorbing agent,
Raw flue gas content of sulfur dioxide before entering absorption tower is 4000mg/Nm3, amount of nitrogen oxides is 100mg/Nm3Respectively through
After one-level, two-grade desulfurizing, the content of sulfur dioxide in flue gas is reduced to 35mg/Nm3, amount of nitrogen oxides is reduced to 50mg/Nm3,
Meet discharge standard.Wherein, owing to sodio absorbent can be constantly regenerating, calcium-base absorbing agent may be used for making stone after desulfurization
Cream, it is possible to decrease fume treatment cost.
Comparative example:
The above-mentioned desulphurization system of same employing, removes current equalizer and oxidation accelerator, owing to serosity collection device is placed in
Between first grade desulfurizing and two-grade desulfurizing, it is that flue gas is mainly concentrated along tower wall, it is impossible to realize uniform, cause two-grade desulfurizing effect not
Ideal, same content of sulfur dioxide is 4000mg/Nm3Flue gas, amount of nitrogen oxides is 100mg/Nm3By this comparative example
After processing, the content of sulfur dioxide in flue gas is reduced to 50mg/Nm3, it is impossible to qualified discharge.For nitrogen oxide removal efficiency
Almost nil, it is impossible to realize cooperation-removal.
Claims (5)
1. a double alkali Two-way Cycle coordinated desulfurization denitrating system, it is characterised in that including:
A tower body as flue gas path；
Be sequentially arranged a gas approach along flue gas flow direction in described tower body, a sodio works in coordination with absorber portion and a calcium-based desulfurization absorbs
Section；
Described gas approach is provided with an oxidation accelerator injection apparatus；
Described calcium-based desulfurization absorber portion includes: some two grades of spraying layers, is positioned at the serosity below described two grades of spraying layers and collects
Device, the fairing between described two grades of spraying layers and described serosity collection device, and it is communicated in described two grades of sprays
Drench the calcium-base absorbing agent pond between layer and described serosity collection device；
Described sodio is worked in coordination with absorber portion and is included: connection is positioned at some one-levels spray in the sodio absorbent pond bottom described tower body
Layer；
Described sodio absorbent pond and calcium-based slurries pond connect a regenerating unit simultaneously；
One regeneration serum outlet of described regenerating unit is communicated to the sodio absorbent pond bottom described tower body.
2. double alkali Two-way Cycle coordinated desulfurization denitrating system as claimed in claim 1, it is characterised in that described oxidation accelerator sprays
Injection device includes the multiple nozzles being arranged on the sidewall of described gas approach.
3. double alkali Two-way Cycle coordinated desulfurization denitrating system as claimed in claim 1, it is characterised in that fairing is selected from water conservancy diversion
Plate, perforated trays, flow straightening grid or rectifier tube row.
4. double alkali Two-way Cycle coordinated desulfurization denitrating system as claimed in claim 1, it is characterised in that described serosity collection device
Bottom arranges multiple projection, and top or the sidepiece of described projection have passage.
5. double alkali Two-way Cycle coordinated desulfurization denitrating system as claimed in claim 1, it is characterised in that described serosity collection device
Bottom is tapered.
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| CN201620459272.2U CN205850545U (en) | 2016-05-19 | 2016-05-19 | Double alkali Two-way Cycle coordinated desulfurization denitrating systems |
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| CN201620459272.2U CN205850545U (en) | 2016-05-19 | 2016-05-19 | Double alkali Two-way Cycle coordinated desulfurization denitrating systems |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105879623A (en) * | 2016-05-19 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Dual-alkali and dual-circulation collaborative desulfurization and denitrification system and method |
| CN109126441A (en) * | 2018-08-08 | 2019-01-04 | 江苏吉能达环境能源科技有限公司 | A kind of intelligent flue gas denitration device |
-
2016
- 2016-05-19 CN CN201620459272.2U patent/CN205850545U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105879623A (en) * | 2016-05-19 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Dual-alkali and dual-circulation collaborative desulfurization and denitrification system and method |
| CN109126441A (en) * | 2018-08-08 | 2019-01-04 | 江苏吉能达环境能源科技有限公司 | A kind of intelligent flue gas denitration device |
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